Adhesives - Wood-to-wood adhesive bonds - Determination of shear strength by tensile loading

ISO 6237:2017 specifies a method for determining the shear strength of wood-to-wood adhesive bonds, with a standard specimen loaded in tension and under specified conditions of preparation, conditioning and testing. This method is intended for testing only those adhesives used in bonding wood to wood in either parallel-laminated or cross-laminated construction.
This method is not intended for use in testing manufactured products.

Adhésifs - Joints collés de bois à bois - Détermination de la résistance au cisaillement par effort de traction

Lepila - Lepila za les - Ugotavljanje strižne trdnosti z natezno obremenitvijo

General Information

Status
Published
Publication Date
10-Jun-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-Jun-2020
Due Date
15-Aug-2020
Completion Date
11-Jun-2020

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SLOVENSKI STANDARD
SIST ISO 6237:2020
01-september-2020
Lepila - Lepila za les - Ugotavljanje strižne trdnosti z natezno obremenitvijo

Adhesives - Wood-to-wood adhesive bonds - Determination of shear strength by tensile

loading

Adhésifs - Joints collés de bois à bois - Détermination de la résistance au cisaillement

par effort de traction
Ta slovenski standard je istoveten z: ISO 6237:2017
ICS:
83.180 Lepila Adhesives
SIST ISO 6237:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ISO 6237:2020
---------------------- Page: 2 ----------------------
SIST ISO 6237:2020
INTERNATIONAL ISO
STANDARD 6237
Third edition
2017-11
Adhesives — Wood-to-wood adhesive
bonds — Determination of shear
strength by tensile loading
Adhésifs — Joints collés de bois à bois — Détermination de la
résistance au cisaillement par effort de traction
Reference number
ISO 6237:2017(E)
ISO 2017
---------------------- Page: 3 ----------------------
SIST ISO 6237:2020
ISO 6237:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 6237:2020
ISO 6237:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Apparatus ..................................................................................................................................................................................................................... 1

4.1 Apparatus for preparation of adhesive .............................................................................................................................. 1

4.2 Test apparatus ......................................................................................................................................................................................... 1

5 Test specimens........................................................................................................................................................................................................ 2

6 Preparation of test panels .......................................................................................................................................................................... 4

7 Conditioning of test panels ........................................................................................................................................................................ 4

8 Preparation of specimens ........................................................................................................................................................................... 4

9 Procedure..................................................................................................................................................................................................................... 4

10 Expression of results ........................................................................................................................................................................................ 5

11 Test report ................................................................................................................................................................................................................... 5

Annex A (normative) Information required prior to testing ...................................................................................................... 7

Annex B (normative) Timber species, thickness, surfaces, quality and moisture content ..........................8

© ISO 2017 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 6237:2020
ISO 6237:2017(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www.iso.org/iso/foreword.html

This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11,

Products.

This third edition cancels and replaces the second edition (ISO 6237:2003), which has been technically

revised.
iv © ISO 2017 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 6237:2020
INTERNATIONAL STANDARD ISO 6237:2017(E)
Adhesives — Wood-to-wood adhesive bonds —
Determination of shear strength by tensile loading
1 Scope

This document specifies a method for determining the shear strength of wood-to-wood adhesive bonds,

with a standard specimen loaded in tension and under specified conditions of preparation, conditioning

and testing. This method is intended for testing only those adhesives used in bonding wood to wood in

either parallel-laminated or cross-laminated construction.
This method is not intended for use in testing manufactured products.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 472, Plastics — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 472 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Apparatus
4.1 Apparatus for preparation of adhesive

4.1.1 Balance and equipment capable of measuring the proportions of the adhesive mix to within a

tolerance of ±1 %.

4.1.2 Mixing equipment to ensure homogeneous mixing of the constituents with minimum aeration

of the adhesive (except foamed adhesive).

4.1.3 Spreading equipment such as a wire-wound bar, roller spreader, curtain coater or suitable

hand applicators, capable of spreading the adhesive uniformly within ±5 % of the desired thickness.

4.1.4 Equipment, designed to exert the required pressure evenly over the whole bonded area

within ± 5 % of the desired value, for example a press or clamps. If necessary, heated platens capable of

maintaining the prescribed temperature within ±2 °C during pressing.
4.2 Test apparatus
4.2.1 Analytical balance.
© ISO 2017 – All rights reserved 1
---------------------- Page: 7 ----------------------
SIST ISO 6237:2020
ISO 6237:2017(E)

4.2.2 Linear measuring device, to read to 0,05 mm, e.g. vernier calipers or micrometer.

4.2.3 Test machine, capable of exerting a tensile force of at least 5 kN with an accuracy of ±2 %. The

force shall be applied at a uniformly increasing rate in the range 2,5 kN/min to 6 kN/min or at a uniform

crosshead speed between 0,5 mm/min and 1,0 mm/min unless otherwise agreed between the interested

parties.

The test machine shall be equipped with suitable grips and jaws so that the specimen is held tightly

without slipping during testing and is held in alignment so that the stress is applied as required in

Clause 9.

It is necessary for all equipment, including gauges, thermometers, etc., to be calibrated regularly, as

prescribed by the test authority of each country.
5 Test specimens

5.1 The timber species, timber quality and timber moisture content for the specimens shall be as

described in Annex B.

5.2 The test specimen shall be of a two-ply or three-ply construction and shall conform to the form

and dimensions shown in Figures 1 and 2. The test specimens shall be cut from test panels prepared as

described in this clause and Clause 6.
Dimensions in millimetres
a) Two-ply tensile shear specimen b) Three-ply tensile shear specimen
Key
Cut up to but not beyond glue line.
Width of sawcut.
Direction of grain of both veneers.
Glue lines.

Direction of grain of face veneers (direction of grain of central veneer shall be at right angles to grain of two

face veneers).
Figure 1 — Test specimens
2 © ISO 2017 – All rights reserved
---------------------- Page: 8 ----------------------
SIST ISO 6237:2020
ISO 6237:2017(E)
Dimensions in millimetres
Key
Width of sawcut.
Direction of grain.
Figure 2 — Suggested arrangement of specimens

5.2.1 For the specimen of two-ply construction, the grain of both plies shall be parallel to the long

dimension of the specimen.

5.2.2 For the specimen of three-ply or cross-laminated construction, the grain of the face plies shall be

parallel to the long dimension of the specimen and the grain of the centre ply shall be parallel to the short

dimension of the specimen and at right angles to the grain of the two outer plies.

NOTE Both types are suitable for general testing of close contact adhesives but values obtained with the two

different specimens are not comparable. Two-ply specimens are often used for applications where the grain of

the adherends is parallel while the three-ply specimens may be preferred for adhesives predominantly used in

the production of wooden panels such as plywood or particle board.

5.2.3 For adhesive quality control purposes, test a minimum of four specimens from each of three

panels of similar construction.
© ISO 2017 – All rights reserved 3
---------------------- Page: 9
...

INTERNATIONAL ISO
STANDARD 6237
Third edition
2017-11
Adhesives — Wood-to-wood adhesive
bonds — Determination of shear
strength by tensile loading
Adhésifs — Joints collés de bois à bois — Détermination de la
résistance au cisaillement par effort de traction
Reference number
ISO 6237:2017(E)
ISO 2017
---------------------- Page: 1 ----------------------
ISO 6237:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6237:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Apparatus ..................................................................................................................................................................................................................... 1

4.1 Apparatus for preparation of adhesive .............................................................................................................................. 1

4.2 Test apparatus ......................................................................................................................................................................................... 1

5 Test specimens........................................................................................................................................................................................................ 2

6 Preparation of test panels .......................................................................................................................................................................... 4

7 Conditioning of test panels ........................................................................................................................................................................ 4

8 Preparation of specimens ........................................................................................................................................................................... 4

9 Procedure..................................................................................................................................................................................................................... 4

10 Expression of results ........................................................................................................................................................................................ 5

11 Test report ................................................................................................................................................................................................................... 5

Annex A (normative) Information required prior to testing ...................................................................................................... 7

Annex B (normative) Timber species, thickness, surfaces, quality and moisture content ..........................8

© ISO 2017 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 6237:2017(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www.iso.org/iso/foreword.html

This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11,

Products.

This third edition cancels and replaces the second edition (ISO 6237:2003), which has been technically

revised.
iv © ISO 2017 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 6237:2017(E)
Adhesives — Wood-to-wood adhesive bonds —
Determination of shear strength by tensile loading
1 Scope

This document specifies a method for determining the shear strength of wood-to-wood adhesive bonds,

with a standard specimen loaded in tension and under specified conditions of preparation, conditioning

and testing. This method is intended for testing only those adhesives used in bonding wood to wood in

either parallel-laminated or cross-laminated construction.
This method is not intended for use in testing manufactured products.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 472, Plastics — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 472 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Apparatus
4.1 Apparatus for preparation of adhesive

4.1.1 Balance and equipment capable of measuring the proportions of the adhesive mix to within a

tolerance of ±1 %.

4.1.2 Mixing equipment to ensure homogeneous mixing of the constituents with minimum aeration

of the adhesive (except foamed adhesive).

4.1.3 Spreading equipment such as a wire-wound bar, roller spreader, curtain coater or suitable

hand applicators, capable of spreading the adhesive uniformly within ±5 % of the desired thickness.

4.1.4 Equipment, designed to exert the required pressure evenly over the whole bonded area

within ± 5 % of the desired value, for example a press or clamps. If necessary, heated platens capable of

maintaining the prescribed temperature within ±2 °C during pressing.
4.2 Test apparatus
4.2.1 Analytical balance.
© ISO 2017 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 6237:2017(E)

4.2.2 Linear measuring device, to read to 0,05 mm, e.g. vernier calipers or micrometer.

4.2.3 Test machine, capable of exerting a tensile force of at least 5 kN with an accuracy of ±2 %. The

force shall be applied at a uniformly increasing rate in the range 2,5 kN/min to 6 kN/min or at a uniform

crosshead speed between 0,5 mm/min and 1,0 mm/min unless otherwise agreed between the interested

parties.

The test machine shall be equipped with suitable grips and jaws so that the specimen is held tightly

without slipping during testing and is held in alignment so that the stress is applied as required in

Clause 9.

It is necessary for all equipment, including gauges, thermometers, etc., to be calibrated regularly, as

prescribed by the test authority of each country.
5 Test specimens

5.1 The timber species, timber quality and timber moisture content for the specimens shall be as

described in Annex B.

5.2 The test specimen shall be of a two-ply or three-ply construction and shall conform to the form

and dimensions shown in Figures 1 and 2. The test specimens shall be cut from test panels prepared as

described in this clause and Clause 6.
Dimensions in millimetres
a) Two-ply tensile shear specimen b) Three-ply tensile shear specimen
Key
Cut up to but not beyond glue line.
Width of sawcut.
Direction of grain of both veneers.
Glue lines.

Direction of grain of face veneers (direction of grain of central veneer shall be at right angles to grain of two

face veneers).
Figure 1 — Test specimens
2 © ISO 2017 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 6237:2017(E)
Dimensions in millimetres
Key
Width of sawcut.
Direction of grain.
Figure 2 — Suggested arrangement of specimens

5.2.1 For the specimen of two-ply construction, the grain of both plies shall be parallel to the long

dimension of the specimen.

5.2.2 For the specimen of three-ply or cross-laminated construction, the grain of the face plies shall be

parallel to the long dimension of the specimen and the grain of the centre ply shall be parallel to the short

dimension of the specimen and at right angles to the grain of the two outer plies.

NOTE Both types are suitable for general testing of close contact adhesives but values obtained with the two

different specimens are not comparable. Two-ply specimens are often used for applications where the grain of

the adherends is parallel while the three-ply specimens may be preferred for adhesives predominantly used in

the production of wooden panels such as plywood or particle board.

5.2.3 For adhesive quality control purposes, test a minimum of four specimens from each of three

panels of similar construction.
© ISO 2017 – All rights reserved 3
---------------------- Page: 7 ----------------------
ISO 6237:2017(E)

5.2.4 Where greater precision is required, test at least 40 specimens, eight from each of five different

panels of similar construction.
6 Preparation of test panels

6.1 Cut the veneer into suitable sizes and assemble in groups of two or three sheets (see 5.2).

6.2 Prepare the adhesive in accordance with the procedure specified by the manufacturer of the

adhesive.
6.3 Th
...

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